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Hitunglah pH larutan 0,4 M, diketahui .

Hitunglah pH larutan begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end style 0,4 M, diketahui begin mathsize 14px style K subscript b space N H subscript 4 O H equals 2 cross times 10 to the power of negative sign 5 end exponent end style.

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Jawaban:

Larutan begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end style merupakan garam yang berasal dari basa lemah dan asam kuat sehingga garam tersebut bersifat asam. pH larutan tersebut sebagai berikut.
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript w over K subscript a cross times open square brackets N H subscript 4 to the power of plus sign close square brackets cross times 2 end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction cross times left parenthesis 4 cross times 10 to the power of negative sign 1 end exponent right parenthesis cross times 2 end root end cell row blank equals cell square root of 4 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 2 cross times 10 to the power of negative sign 5 end exponent end cell row blank blank blank row pH equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log left parenthesis 2 cross times 10 to the power of negative sign 5 end exponent right parenthesis end cell row blank equals cell 5 minus sign log space 2 end cell end table end style
 

Maka, Hitunglah pH larutan begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end style 0,4 M adalah 5 - log 2.

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